On Thu, Apr 21, 2005 at 10:44:23AM -0500, Drew Winstel wrote: > It has been a busy week, I know, but does anyone have any tips? You could try setting read cache disable, I don't know if that setting must be honored, or how ATA/SATA handle it. See mode page 8 for SCSI block commands. The sg utilities sg_modes can probably set it. Better yet, do IO to more locations on the disk, not just the very beginning and the very end. > The reads we're calling are getting cached. If we call 100 reads--50 to the > beginning of the drive alternating with 50 to the end--the first read will > sometimes appear to have a realistic result, then the rest will all complete > in the neighborhood of 10 microseconds. -- Patrick Mansfield - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
